Any body really good at social studies or history that could help me pls?

What did economist john maynard keynes believe about deficit spending?

The social contact theory states that

Using mr smith and his id, identify two potential internal validity threats that might affect the a—b design. tell me how that threat might impact conclusions in the a—b design. note #1: you cannot use maturation (since i already did that one for note #2: there are some mr smith id threats that won’t have much impact in a single case design.